Process of casting metals.



PATENTED JULY 14, 1908. M. OASPERSSON.

W.- PETERS & 0

PROCESS OF CASTING METALS.

APPLICATION FILED AUG. 23, 1907 nwmto as W fizzy;- M4 /72 @amdan W m M a UNITED STATES PATENT OFFICE.

WILLIAM PETERS AND GLAS M. GASPERSSON, OF MONESSEN, PENNSYLVANIA.

PROCESS OF CASTING METALS.

7 To all whom it may concern:

Be it known that we, VVILLIAM PETERS, citizen of the United States of America, and (has M. OASPERSSON, a subject of the King of Sweden, residing at Monessen, in the county of Westmoreland and State of Pennsylvania, have invented certain new and useful Improvements in Processes of Casting Metals, of which the following is a specification, reference being had therein to the accompanying drawing.

This invention relates to a process of casting metals, and its object is to produce metallic castings of superior quality by the utilization of compressed air, oxygen or other fluid under pressure.

Another object of this invention is to prevent the splitting orpiping of a casting or ingot.

It is a well known fact that in theprocess of cooling a casting or ingot, two important actions take place. First, there occurs what is known as a segregation of the material; that is to say, certain of the constituents of the steel, such as carbon, phosphorus, and other impurities being of lighter specific gravity, tend to separate out from the mass and gather towards the top of the casting or ingot. Also, since the metal cools from the outside towards the center, there is a tendency of the solidifying metal to shrink towards the outer surface and this causes a cup-shaped depression at the top of the ingot or casting, which extends down in the form of a narrow slit or crack into the body of the metal, which, together with gas bubbles, forms which is known as pipes. It is therefore apparent that the upper portion of the ingot or casting, because of its segregation or piping, is less pure, more brittle, and as in the case of an ingot, is subject after rolling to contain longitudinal flaws. It has been the practice to crop off approXimately twenty-live per cent. of the ingot and use the remaining part for the article to be produced by rolling.

By our improved process, we aim to prevent the segregation and rapid cooling of an ingot, and with a casting, we use suflicient metal to prevent a pipe from being formed in the body of the casting, allowing the same Specification of Letters Patent.

Application filed August 23, 1907.

Patented July 14, 1908.

Serial No. 389,870.

if it is formed to occur in a crop form upon the end of the casting.

The process consists in pouring molten metal into a suitable mold, and then subj ecting the molten article to a blast of compressed air or otherfluid to solidify the same.

In the accompanying drawings, Figure l is a vertical sectional view of a mold employed in carrying out our improved process, Fig. 2 is a plan of the same. i

The reference numeral 1 designates the body of the flask or mold, surmounted by a head-box 2. The flask l is adapted to contain sand or similar material, as indicated at 3, to receive a pattern, while in the head-box is placed sand l to provide a gate 5. After the removal of the form or pattern, molten metal is poured into the flask to form the product 6, after which the molten article is subjected to a blast of air or oxygen under pressure.

The reference numeral 7 designates a suit able blow pipe or nozzle protruding into the head-box 2 to subject the top of the molten product to the action of air or a similar fluid under pressure. It will be observed that an excess amount of molten metal is used to pro duce the product 6, and that this metal forms a crop 8 in the head-box 2, and when said box is removed, the crop can be sawed ofl.

The blast of air striking the top of the molten metal increases its solidification, and the density of the finished product, preventing segregation from taking place in the body of the product 6 and thereby producing an article of greater strength, density and durability.

Having now described our invention what we claim as new is A method of casting comprising the forming of the product with a removable crop having a neck from sufficient metal to prevent the body of the product from piping, and then subjecting the crop prior to the cooling thereof to a blast of fluid under pressure.

In testimony whereof we affix our signatures in the presence of two witnesses.

WVILLIAM PETERS. CLAS M. CASPERSSON. WVitnesses:

G. SPIEGELBERG, WM. H. ZELLERS, Jr. 

